Occlusion Confusion

Self Instruction Exercise No. 324
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Exercise No. 324
Subject Code: 182
TM Disorders (Occlusion)

The 15 questions for this exercise are based on the article, Occlusion Confusion, on pages 69-75. This exercise was developed by Thomas C. Johnson, DMD, MAGD, in association with the General Dentistry Self-Instruction Committee.

Reading the article and successfully completing this exercise will enable you to:

  • discuss the 3 factors contributing to occlusion confusion;
  • learn the signs of parafunction/dysfunction; and
  • understand the management of parafunction and an ideal occlusal scheme.

Answers for this exercise must be received by December 31, 2013.

  1. Which of the following statements is true regarding occlusion?

    A. Most practitioners are aware of the basic concepts of occlusion.
    B. Most dental patients receive dental therapy based on occlusal principles.
    C. Occlusal principles permeate almost all of dentistry.
    D. Commonly taught occlusal techniques are practical in daily practice.

  2. A valid definition of occlusion is a description of all the components of the stomatognathic system. The preferred definition of occlusion is the contact of the teeth of both jaws during those excursive movements of the mandible essential to the function of mastication.

    A. Both statements are true.
    B. The first statement is true; the second is false.
    C. The first statement is false; the second is true.
    D. Both statements are false.

  3. Which is true regarding the vertical function paradigm?

    A. There is 5-6 mm lateral parafunction (bruxing).
    B. On closure, the mandible is guided by the glenoid fossae.
    C. The condyles seat in the anterior-superior portion of the fossae.
    D. The chewing movement is consistent and reproducible.

  4. Which is true according to the horizontal function paradigm?

    A. It seeks to accommodate free passage for opposing dentition.
    B. Laterotrusive contacts are prevented, not eliminated.
    C. Lateral excursions are parafunctional movements.
    D. Anterior guidance involves shortening the anterior teeth.

  5. According to gnathology, proper occlusal form is dictated by anterior guidance. Functional occlusion is defined as the touching of upper and lower teeth during mastication and deglutition.

    A. Both statements are true.
    B. The first statement is true; the second is false.
    C. The first statement is false; the second is true.
    D. Both statements are false.

  6. Which type of denture morphology has been shown to transfer higher vertical stimulation to the alveolar ridge?

    A. 20° occlusion
    B. Upper 10° occlusion
    C. 33° occlusion
    D. 0° (flat plane) occlusion

  7. The signs of DCS include all of the following except one. Which is the exception?

    A. Deformation of restorative materials
    B. Atrophy of the alveolar bone supporting teeth
    C. Hypertrophy of the muscles of mastication
    D. Flattening of the dentition

  8. The characteristics of the wedge-shaped noncarious lesions (NCLs) include all of the following except one. Which is the exception?

    A. Position will change as bone support is lost
    B. Site-specific with a dull matte appearance
    C. Variously shaped and located depending on the vectors of forces
    D. Explained by biomechanical stress studies

  9. Evidence supporting parafunction as a cause of wedge-shaped NCLs include all of the following except one. Which is the exception?

    A. Photodensitometry studies
    B. Stress analysis
    C. Piezoelectric effect
    D. Compression fatigue

  10. Which is the most common compression NCL?

    A. Luders’ lines
    B. Wedge-shaped gingival lesion
    C. Cracked fillings
    D. Inverted cupola

  11. The inverted cupola is most commonly found on permanent second molars. This is due to the higher incidence of occlusal prematurities on these teeth.

    A. Both statements are true.
    B. The first statement is true; the second is false.
    C. The first statement is false; the second is true.
    D. Both statements are false.

  12. When planning an occlusal equilibration, the author’s initial analysis involves use of

    A. mounted models and trial equilibration.
    B. occlusal indicator wax.
    C. multiple colors of Mylar articulating strips.
    D. Mylar articulating strips and 8-µm shim stock.

  13. The author’s approach to the treatment of parafunction advocates which of the following?

    A. LVI neuromuscular
    B. Pankey centric relation equals centric occlusion scheme
    C. Okeson orthopedically stable joint position
    D. Prevention of DCS

  14. The vast majority of temporomandibular joint dysfunction problems are a result of

    A. repetitive motion trauma from DCS.
    B. arthritic disease processes.
    C. developmental deformities.
    D. trauma.

  15. Teeth in an ideal occlusion have all of the following characteristics except one. Which is the exception?

    A. Mutually protected scheme
    B. Fit loosely with their antagonists
    C. Are naturally sharp
    D. Occlusal contact confined to the tip of the cusp


Evaluation

Please respond to the statements below, using the following scale:
1 Poor; 2 Below average; 3 Average; 4 Above average; 5 Excellent

Practicality of the content 1 2 3 4 5
Benefit to your clinical practice 1 2 3 4 5
Quality of illustrations 1 2 3 4 5
Clarity of objectives 1 2 3 4 5
Clarity of exercise questions 1 2 3 4 5
Relevance of exercise questions 1 2 3 4 5
 
Did this exercise achieve its objectives? Yes No
Did this article present new information? Yes No
How much time did it take you to complete this exercise? mins


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